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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4349d74de17f70ddee89f988fe4acc91628a4c793462f61446e68871ab7a1b87' 
  AND token = 'd2TOvRSgWI8WCRWhN7QxeLrn+GZPsbedicDCCM3729I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}